Specifications

SYNC I/O Guide90
GPI Relay Wiring for Fader-Start
The Universal Slave Driver provides a total of
four Relay-level GPI outputs on pins 3/4, 3-10 of
the DB25 connector (see the circuit diagram GPI
(TTL)/MTC Outputs).
The GPI Relay outputs are intended to drive Re-
lay loads only.
GPI Triggers
GPI output signals information:
0 (relay) = Play
1 (relay) = Record Ready
2 (relay) = fader start #1
3 (relay) = fader start #2
4 (TTL) = Stop
5 (TTL) = Record
Logical GPI numbers 0 through 3 are associated
with GPI relay outputs 0 through 3 (pins 3
through 10). GPI numbers 4 and 5 are associated
with GPI TTL outputs 0 and 1 (pins 1 and 2).
GPI TTL WIring
The circuit can drive approximately 2 mA
through a load of 1.6K and maintain a logic
high level of 3.3V. In an application where the
equipment being controlled has more demand-
ing power requirements, an external buffer or
relay circuit mst be used. This would typically be
constructed as part of a custom electrical inter-
face.
Each GPI TTL output is fully short-circuit pro-
tected via a 220-ohm series resistor.
Before attempting to wire any type of custom in-
terface, always check the electrical specifications
provided by the equipment manufacturer, in-
cluding voltage levels, current, loading and po-
larity. Incorrect wiring may damage your equip-
ment, your SYNC I/O or cause personal injury.